Under the Kyoto Protocol, industrialised countries are required to reduce their emissions of greenhouse gases. The Kyoto Protocol envisages market-based "flexible mechanisms". These allow industrialised countries to meet their targets by trading emission allowances between themselves, and also by gaining credits for emission-curbing projects in developing countries.

The Clean Development Mechanism (CDM) covers such projects in countries without targets, i.e. developing countries. Credits will only be issued for reductions if a project provides real, measurable and long-term climate change benefits.

Credits issued under Joint Implementation (JI), joint projects between industrialised countries with Kyoto targets, are called ERUs (Emission Reduction Units).

The rationale behind these CDM and JI mechanisms is that greenhouse gas emissions are a global problem and that the place where reductions are achieved is of less importance. Because of this, reductions can be made where costs are lowest, at least in the initial phase of combating climate change.


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Market Watch: CER market report